Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations cover the safety profile (readOnlyHint=false, destructiveHint=false, openWorldHint=true, idempotentHint=false). The description adds genuinely new context: it records the task only and never personal data, which tells the agent what is transmitted and the privacy constraint. It stops short of saying who receives it or whether submission is anonymous.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.